The algae comprise a large and heterogeneous assemblage of relatively simple plants which have little in common except their characteristic oxygen evolving type of photosynthesis. They exhibit great diversity in size and appearance and are found in freshwater of all kinds, barks, soils, rocks and marine habitats. Many unicellular forms, such as desmids and diatoms, are extremely beautiful microscopic objects. Some of the larger forms, especially the red seaweeds, are highly attractive and when mounted and dried on herbarium sheets appear like paintings.
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